*{
    margin: 0;
    padding: 0;
}

html {
    font: 45% 'Heiti SC','Hiragino Sans GB',Roboto,'Droid Sans','Droid Sans Fallback','Microsoft YaHei',Simsun,Tahoma,Arial,sans-serif;
    color: #646464;
}

html body{
    width: 100%;
}

.content{
    width: 91%;
    position: relative;
    margin: 5px auto;
}

.body1{
    font-size: 3.5rem;
    color: #ff0000;
}

.img {
    width: 80%;
    position: relative;
    margin: 5% auto;
}

.img img{
    width: 100%;
}

#out{
    position: relative;
    margin-bottom: 100px;
}

.header{
    width: 91%;
    position: relative;
    margin: 20px auto;
    border-radius:25px;
    background: #e8e8e8;
}

.font1{
    font-size: 2.8rem;
    padding: 20px 15px;
    color: #666;
    line-height: 3rem;
}

.btm{
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 100px;
    background-color: #f7f6f6;
}

.btm1{
    position: relative;
    margin: 15px auto 15px auto;
    width: 80%;
    text-align: center;
    padding: 15px;
    font-size: 4rem;
    background-color: #f5374b;
    border-radius: 45px;
}

a{
    color: #fff;
    text-decoration: none;
}

@media screen and (max-width: 375px){
    #out{margin-bottom: 65px}
    .font1{
        font-size: 1.7rem;
        line-height: 1.8rem;
        padding: 15px 15px;
    }
    .body1{font-size: 2rem;}
    .btm{height: 60px;}
    .btm1{
        padding: 6px;
        font-size: 2.3rem;
        margin: 15px auto;
        width: 40%;
    }
}

@media screen and (min-width: 414px) and (max-width: 568px){
    #out{margin-bottom: 80px}
    .font1{font-size: 2rem;line-height: 2rem}
    .body1{font-size: 2.5rem;}
    .btm{height: 70px;}
    .btm1{
        padding: 10px;
        font-size: 2.5rem;
        margin: 15px auto;
    }
}

@media screen and (min-width: 667px) and (max-width: 736px){
    #out{margin-bottom: 100px}
    .font1{font-size: 2.5rem;line-height: 2.5rem}
    .body1{font-size: 3rem;}
    .btm1{
        font-size: 3rem;
        margin: 15px auto;
    }
}
@media screen and (min-width: 768px) {
    .img{width: 75%;}
    #img1{width: 65%;}
    #img2{width: 65%;}
    .btm1{width: 25%; padding: 10px; }
}